dimmick



(No Model.) 2 Sheets-Sheet 2. J. 0. DIMMICK 8a E. K. WO0DS. ORE GONUBNTRATOR No. 554,914. Patented Feb. 18, 1896.

IIII WITNESSES: INVENTORS m I JdfJ/Qr 0. Lemma/i.

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ANDREW B GRAHM PHMQWASHINETONJ C NITED TATES ATENT ICE JOSEPH OWEN DIMMIOK AND EDWARD KINNEY WOODS, OF DENVER, COLORADO, ASSIGNORS TO THE ELEOTRO-MAGNETIO OONOENTRAT- ING COMPANY, OF SAME PLACE.

ORE-CONCENTRATOR.

SPECIFICATION forming part of Letters Patent No. 554,914, dated February 18, 1896. Application filed April 27, 1895. Serial No. 547,378. (No model.)

same, in a granulated or pulverized form, is

forced by means of water over the concentrator-bed.

It further consists in the construction and novel arrangement of parts, as will hereinafter appear, and as more particularly pointed out in the appended claims.

In the accompanying drawings, forming part of this specification, and in which like characters of reference indicate like parts in the several views, Figure 1 is a side elevation of a concentrator embodying our invention. Fig. 2 is a plan view thereof. Fig. 3 is a vertical section on the line 0a of Fig. 2. Fig. 4 is a vertical section on the line y y of Fig. 2. Fig. 5 is a sectional elevation of a screen employed in the concentrator; and Fig. 6 is a view, on an enlarged scale, of a portion of a feed-trough employed in the concentrator and showing closures for the feedopenings of said trough.

Referring to the drawings, 5 designates the uprights or standards of the frame, secured rigidly together by means of longitudinal strips 6 and transverse strips 7. Bars 8 extend between and are supported by opposite uprights 5. These bars 8 serve to support the concentrator 9, which is inclined downward from its feed end to its outlet end. Therefore the bars 8 are placed at successively lower planes, as shown.

As a means for changing or adjusting the inclination of the concentrator, the uprights 5 are provided with longitudinal slots 5, into which the ends of the bars 8 are extended.

It is obvious that by raising or lowering the bars in these slots, and by employing suitable blocking, the pitch of the concentrator may be adjusted to suit the existing requirements.

The concentrator is shown as rectangular and has a table, upwardly extended side pieces, 17, and an upper-end closure 13*, and it is open at its lower end.

The table of the concentrator comprises a wooden bed-piece 10, a soft-iron plate 11 placed thereon, a wooden top piece, 12, placed on the iron plate 11 and a canvas covering 13.

WVe have shown the metal plate 11 as extended over the entire surface of the bed-piece 10; but it is to be understood that it may extend only a portion of the length of the concentrator when such a construction would meet the requirementsthat is, for instance, in the treatment of pulp containing but a small percentage of metal.

The canvas 13 is stretched evenly and smoothly over the wooden top piece 12, and it may be secured by means of tacks at the edge or otherwise. It is quite necessary that the top piece should have a smooth and even surface to serve as a base for the canvas.

A soft-iron strip is placed at each side of the table upon the canvas and extended the full length thereof. These iron strips 15 serve as pole-pieces of an electric circuit, as will be more fully explained. They may be held in place by battens 16.

Soft-iron rods or pins 14 contact at their lower ends with the iron plate 11 and extend upward through the top piece 12 and the canvas 13, and they project above the plane of the canvas. The pins or rods 14 are shown as arranged in lines closely together, with the pins or rods of one line alternating with those of another line.

A feed-trough 24 is secured across the upper end of the inclined table and serves also as an end closure. This trough has a number of openings 2 L through its front wall, and closures 25 are provided for the openings, to be opened and closed, as desired, to regulate the feed or flow of the pulp in water solution. A deflector or gate 21 is pivotally connected to the lower end of the table and is intended to direct concentrates washed by water over the table into respective compartments of a trough 22. The deflector may be operated by means of a rod 19, movable in bearings secured to the under side of the table, and having a link connection 20 with the deilector.

Pulp is delivered to the feed-trough 24: through a conduit 18, leading from a revolving screen This screen is mounted on a shaft 33, having bearings in a suitable frame 30, an d provided with a power-wheel 39. The pulp from the mill is passed through this screen, screening out the coarse portions, which discharge through a spent 3*, and de' positing material reduced to an even degree of fineness for treatment on the table into a trough 35, leading to a trough 86, with which the conduit 18 is connected.

A spray-pipe 23 is extended across the head of the table near the feed-trough. ater from this spray is used only after a suitable deposit of concentrates has been made 011 the table. The purpose of the water from this spray is to wash and carry elf the sand from the concentrates.

We have described but one concentrator or table. In practice, however, we find it advisable to use the device in pairs, as plainly shown in Figs. 2 and 4:. It will be seen that the trough 24 extends across two tables and is divided between the tables by a partition 2i".

0 is an electromagnet connected by lead wires 1 G to any desired source of electricitysuch, for instance, as a dynamo. The core D has pole-pieces E extended from it and connected to the iron plates 11 of the respective concentrators.

It may be here stated that when a single concentrator is used its plate 11 will then be made in two sections suitably separated, and the poles of the electromagnet connected to the opposite sections. Electrical connection with pole-strips 15 lead from the dynamo, or, as here shown, from a battery II through conneetions A 13.

It is obvious that the electromagnet C will magnetize the plates 11, and through them the pins 14, and that the water containing the pulp and passing over the entire surface of a table will form a contact between opposite pole-strips 15. The electric current thus established is used to electrif y the metallic substances and to cause a decomposition of the water and create oxygen-gas, destroying the greasy slimes floating in the water and on the surface, thus facilitating the precipitation of the particles to a contact with the canvassurface to which they adhere.

The magnetized pins 14: arrestall magnetic particles as the water flows, preventing the iron from passing any considerable distance down the canvas surface, thus leaving a portion of the canvas longer exposed for arresting theiiner particles coming in contact with its surface.

The pins 1% create a rill'ling agitation of the water that brings the sand and waste material to the surface and carries it rapidly down and discharges it into a waste-trough at the foot of the table.

\Vhen the surface of the table has become covered with concentrates to near its lower end, or as fully as judged by the operator to be advisable for the best results, the llow of pulp to the feed-trough is stopped. The sand. lodged on the concentrates is then washed oil? by applying clear water from the spray-pipe. The electric and magnetic currents are then turned off, the spray stopped, the deflector at the foot of the table swung out by the rod beneath the table, and the concentrates washed by water under pressure from a hose 37, having a nozzle 38, down over the table and out over the deflector into a trough which is connected with a series of settling-tronghs from which the water passes off clear from the end trough.

It is obvious that one table of a pair may be in concentrating operation while the other is being washed to clear it of concentrates.

Having thus described our invention, we claim as new and desire to secure by Letters Patent- 1. In an oreconcentrator, apair of inclined tables, each comprising a metal bed-plate, a bed of insulating material over the metal bed, and rows of metallic pins extending from the metal bed through the bed of insulating material, and an electromagnet having one pole connected to the metal bed-plate of one table and the other pole to the metal bed-plate of the other table, substantially as specified.

2. In an ore-concentrator, a table comprising an iron plate or plates, a cover of insulating material on said plate or plates, metal. pins extending through said cover to contact with the plate or plates, the said pins being arranged in several rows, the pins of one row alternating with those of another row, and means for magnetizing the plate or plates and consequently the pins which project above the surface of the table, substantially as specified.

In an oreconcentrator, the combination with a frame, of an inclined table comprising a base-board, a metal plate on said baseboard, a top board on the metal plate, metal pins extended through the top board to contact with the plate, metal pole-pieces at opposite sides of the table connected with a source of electric supply, and means for magnetizing said plate and through it the pins, substantially as specified.

4. In an ore-concentrator, the inclined ad- 3' ustable table, comprising a base or bed board, a metal plate on said board, a top board on the metal plate, a covering of textile material 011 the top board, a number of metal pins or rods extended through the textile material and top board to the metal plate, and means for magnetizing said metal plate and pins or rods, substantially as specified.

5. An ore-concentrator table, comprising a metal plate, a top piece thereon, a cover of textile material on the top piece, metal pins extended from the metal plate upward above the plane of the table, an electromagnet for magn.etizing said plate and pins, metal poletromagnet having its opposite poles connected respectively to the metal plates of adjacent tables, substantially as specified.

'7. A11 ore-concentrator, comprising in combination a table consisting of a bed-piece, a metal plate on said bed-piece, a top piece on the metal plate, a textile covering, metal pins extending from the metal plate through the top piece and textile covering, the said plate having connection with an electromagnet, pole-pieces at the sides of the table having connection with a source of electricity, and a feed-trough, substantially as specified.

JOSEPH OWVEN DIMMIOK. EDWVARD KINNEY WOODS. l Vitnesses O. M. DUNCAN, J As. B. MILLER. 

